Florida is the only state in the continental United States to have extensive
shallow coral reef formations near its coasts. These reefs extend from near
Stuart, on the Atlantic coast, to the Dry Tortugas, west of Key West, in the
Gulf of Mexico. The most prolific reef development occurs seaward of the Florida
Keys. The reefs here are spectacular and rival those of many Caribbean areas.
Approximately 6,000 coral reefs are found between Key Biscayne and Dry Tortugas.
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Florida Reef Facts
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Florida's coral reefs came into existence 5,000 to 7,000 years ago when sea
levels rose following the Wisconsin Ice Age. Reef growth is slow; estimates range
from one to sixteen feet every 1,000 years.
Stony corals are the major reef architects. Polyps, the living portion of the coral,
extract calcium from seawater and combine it with carbon dioxide to construct the
elaborate limestone skeletons that form the reef backbone. Coral polyps are united
into colonies. An individual colony grows one-half to seven inches a year, depending
on the species. Corals start life as free-living larvae that later settle on the sea
floor and develop into massive, sedentary limestone formations.
Though reef corals are classified as animals, there is, in fact, a complex of microscopic
plants that lives within the animal tissues (a symbiotic relationship). The animals
benefit from the energy that the plants provide through photosynthesis. The plants are
protected within the coral tissues and gain nutrients from animal wastes. These tiny plants
are called zooxanthellae and are responsible for much of the color seen in reef corals.
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Coral reefs are specialized habitats that provide shelter, food and breeding sites for
numerous plants and animals. They form a breakwater for the adjacent coast, providing
natural storm protection. They are very important to southeast Florida's economy.
Recreational and commercial fishing annually bring many millions of dollars to the
state. The attractions of the coral reef communities contribute greatly to the total
value of Florida's fisheries.
Coral reef development occurs only in areas with specific environmental characteristics:
a solid structure for the base; warm and predictable water temperatures; oceanic
salinities; clear, transparent waters low in phosphate and nitrogen nutrients, and
moderate wave action to disperse wastes and bring oxygen and plankton to the reef.
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YOUR HELP IS NEEDED
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The tropical setting in Florida's reefs attracts millions of visitors annually. In order to
minimize human damage to the corals, everyone's cooperation is needed. The reefs are well
marked on navigation charts; if you are not familiar with the area, refer to the charts.
When diving or snorkeling, look, but do not touch! Do not grasp, stand or sit on living coral.
You may damage the coral and hurt yourself in the process. All coral is protected. It is against
the law to collect, harvest or sell Florida corals in state and adjacent federal waters.
Visit the
Coral Reef Conservation Program for more information on what you can do to help protect coral reefs.
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Every year careless boaters run aground, destroying coral colonies that are hundreds of years
old. Seen from the surface, reefs have a unique golden-brown color. If you see brown, you may
be about to run aground. Be cautious when anchoring your boat. Do not deploy the anchor directly
in coral. Usually there are sandy areas close by; anchor in the sand. Many popular reefs off Key
Largo and at Looe Key National Marine Sanctuary have special anchor buoys for mooring. In these
areas, tie up to the buoys, rather than anchoring. Do not dispose of trash, bilge washings and
other debris on or near the reefs!
Florida coral reefs, with whom we share the seas, are significant, unique natural resources.
Be a responsible visitor - insure the continued vitality of Florida's coral reefs.
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This page was derived from a brochure developed by the Department of Environmental Protection,
Florida Marine Research Institute under a grant from the NOAA, Office of Ocean and Coastal
Resource Management.
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